If you can squeeze the bank account,the roller cam is a much better choice,more power,better idle.
Before you buy the cam,you need the heads.
heads first,then match cam/intake/carb/headers.
The short block needs the CR matched and rods to fit.If you get a roller(highly recommended) then get a small base circle
what are the power figures that you want and what RPM range are you hoping to operate this engine?